Hmm. There is something odd about that formula. To me it looks like there are four left-side parentheses, but only three right-side parantheses, so I'm not surprised it would be difficult to work with.
Edit: The last parenthesis has to be placed before you multiply by 1.000.000, so it should look like this:
Sensor Range = SQRT((Racial Sensor Strength * HS * Racial EM Sensitivity * (Resolution ^ (1/1. 5)) / PI)) * 1,000,000 km
I don't know if that helps.